adapt voltages for PFS173 (fix for issue #40)

Author: freepdk

fpdkicdata.c

@@ -267,7 +267,7 @@ static const FPDKICDATA fpdk_ic_table[] =
     .vdd_read_hv                  = 2.5,
     .vpp_read_hv                  = 5.5,
     .vdd_cmd_write                = 2.5,
-    .vpp_cmd_write                = 5.5,
+    .vpp_cmd_write                = 6.5,
     .vdd_write_hv                 = 5.8,
     .vpp_write_hv                 = 9.0,
     .write_block_size             = 4,